574 METALLURGY OF CAST IRON. possess small testing machines, and are not that far from the best but that they can in some cases be utilized in giving eriŁ>i1orh approximate comparative data of cast iron, as is shown in Chapters XLIV., LX. and LXIX. The utility of the A, P. A. tests is not confined to the summary given in this chapter. There are other qualities which their wide range of tests offer for study in obtaining valuable knowledge that can be utilized, in some special instances, to assist any in the best practice of making mixtures of iron, grading castings, and testing which they set forth. As the tests were originally obtained chiefly to derive knowledge of what is best to suggest for standardizing the testing of cast iron, we will now present an extract of the A. F. A. committee's final report as tendered by the chairman, Dr. Richard Mol-denke, who is also secretary of the association. AN EXTRACT OF THE A. F. A. COMMITTEE'S REPORT ON STANDARDIZING THE TESTING OF CAST IRON. Your committee desires to state that during the past year (1900) sufficient work has been done to warrant a final report, based upon the results obtained and the conclusions derived therefrom. The magnitude of the operations was fully realized at the inception of the plan (in 1897), but it was held that the necessities of our industry on the one side, and the constantly growing demands from buyers on the other, fully warranted FIG. 148.